1 /* $OpenBSD: a_enum.c,v 1.16 2014/09/21 12:17:42 miod Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <stdio.h> 60 61 #include <openssl/asn1.h> 62 #include <openssl/bn.h> 63 #include <openssl/err.h> 64 65 /* 66 * Code for ENUMERATED type: identical to INTEGER apart from a different tag. 67 * for comments on encoding see a_int.c 68 */ 69 70 int 71 ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v) 72 { 73 int j, k; 74 unsigned int i; 75 unsigned char buf[sizeof(long) + 1]; 76 long d; 77 78 a->type = V_ASN1_ENUMERATED; 79 if (a->length < (int)(sizeof(long) + 1)) { 80 free(a->data); 81 a->data = calloc(1, sizeof(long) + 1); 82 } 83 if (a->data == NULL) { 84 ASN1err(ASN1_F_ASN1_ENUMERATED_SET, ERR_R_MALLOC_FAILURE); 85 return (0); 86 } 87 d = v; 88 if (d < 0) { 89 d = -d; 90 a->type = V_ASN1_NEG_ENUMERATED; 91 } 92 93 for (i = 0; i < sizeof(long); i++) { 94 if (d == 0) 95 break; 96 buf[i] = (int)d & 0xff; 97 d >>= 8; 98 } 99 j = 0; 100 for (k = i - 1; k >= 0; k--) 101 a->data[j++] = buf[k]; 102 a->length = j; 103 return (1); 104 } 105 106 long 107 ASN1_ENUMERATED_get(ASN1_ENUMERATED *a) 108 { 109 int neg = 0, i; 110 long r = 0; 111 112 if (a == NULL) 113 return (0L); 114 i = a->type; 115 if (i == V_ASN1_NEG_ENUMERATED) 116 neg = 1; 117 else if (i != V_ASN1_ENUMERATED) 118 return -1; 119 120 if (a->length > (int)sizeof(long)) { 121 /* hmm... a bit ugly */ 122 return -1; 123 } 124 if (a->data == NULL) 125 return 0; 126 127 for (i = 0; i < a->length; i++) { 128 r <<= 8; 129 r |= (unsigned char)a->data[i]; 130 } 131 if (neg) 132 r = -r; 133 return (r); 134 } 135 136 ASN1_ENUMERATED * 137 BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai) 138 { 139 ASN1_ENUMERATED *ret; 140 int len, j; 141 142 if (ai == NULL) 143 ret = ASN1_ENUMERATED_new(); 144 else 145 ret = ai; 146 if (ret == NULL) { 147 ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED, ERR_R_NESTED_ASN1_ERROR); 148 goto err; 149 } 150 if (BN_is_negative(bn)) 151 ret->type = V_ASN1_NEG_ENUMERATED; 152 else 153 ret->type = V_ASN1_ENUMERATED; 154 j = BN_num_bits(bn); 155 len = ((j == 0) ? 0 : ((j / 8) + 1)); 156 if (ret->length < len + 4) { 157 unsigned char *new_data = realloc(ret->data, len + 4); 158 if (!new_data) { 159 ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED, ERR_R_MALLOC_FAILURE); 160 goto err; 161 } 162 ret->data = new_data; 163 } 164 ret->length = BN_bn2bin(bn, ret->data); 165 166 /* Correct zero case */ 167 if (!ret->length) { 168 ret->data[0] = 0; 169 ret->length = 1; 170 } 171 return (ret); 172 173 err: 174 if (ret != ai) 175 ASN1_ENUMERATED_free(ret); 176 return (NULL); 177 } 178 179 BIGNUM * 180 ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn) 181 { 182 BIGNUM *ret; 183 184 if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL) 185 ASN1err(ASN1_F_ASN1_ENUMERATED_TO_BN, ASN1_R_BN_LIB); 186 else if (ai->type == V_ASN1_NEG_ENUMERATED) 187 BN_set_negative(ret, 1); 188 return (ret); 189 } 190